Turn-table for cranes



(No Model.) 2 Sheets-Sheet 1.

W. H. WHEELER.

TURN TABLE FOR GRANES. u

N0. 398,867. Pg nted Mar. 5, 1889.

I; j j

, i HW (No Model.) 2 Sheets-Sheet 2,

W. H. WHEELER.

TURN TABLE FOR GRANES.

No. 398,867. Patented Mar. 5. 1889.

7% 1 g x I N. PETERS. Phoio-[vllwumphen Wnshiuglou, D. c.

UNITED STATES.

PATENT OFFICE.

WILLIAM HARRISON WHEELER, OF SCIOTOTLLE, OHIO.

TU RN-TABLE FOR CRANES.

SPECIFICATION forming part of Letters Patent No. 398,867, dated March 5, 1889.

Application filed November 30, 1888. Serial No. 292,300. (No model.)

To aZZ whom it may concern.-

Be it known that I, WILLIAM HARRISON WHEELER, a citizen of the United States, residing at Sciotoville, in the county of Scioto and State of Ohio, have invented a new and useful Improvement in Turn -Tables for Cranes, of which the following, is a specification.

My invention relates to an improvement in turntables for cranes; and it consists in the peculiarconstruction and combination of devices, that will be more fully set forth hereinafter, and particularly pointed out in the claims.

In the accompanying drawings, Figure l is a side elevation of a crane embodying myimprovements. Fig. 2 is a top plan view of the same. Fig. 3 is a front elevation. Fig. 4 is a sectional view taken on the line m of Fig. 3.

A represents a pair of vertical standards, which are connected at their upper ends by a cross-beam, B, and are braced against forward inclination by a pair of inclined beams, C.

D represents across-beam,which also connects the standards A at a suitable distance below the beam B. A frame comprising two pairs of standards, E, and cross-beams F, connecting their upper ends, and in the same horizontal plane with the beam D, is arranged in rear of the standards A, and the said beams D and F are connected together by a pair of rearward-con vergin boards or joists, G,whieh are bolted thereon, as shown.

On the upper sides of the joists G, near their rear ends, are blocks II, and on the said blocks are bars 1, said blocks and bars being bolted to the joists l and the rear ends of said bars project in g rearward beyond the blocks ll. Adjusting-openings K are made in the bars I and in the joists, and in the said openings are fitted adjustable pins L, on which are journaled pulleys M.

N represents a pair of longitudinal beams, which are bolted on the beam I) and on the forward beam, F, near the centers of said beams, and project forward beyond the beams E, as shown. Radial beams O are also bolted on the beam D and the foremost beam, F, and are arranged beyond the outer side of the beams N, and also project beyond the front side of beam D. A double platform, P, which is semicircular in shape, is bolted on the upper and lower sides of the projecting ends of beams N O and let into the said beams, the outer edges of the upper and lower sides of the platform projecting beyond the ends of the radial beams and forming flanges R.

S represents a series of sheaves or pulleys arranged between the flanges R and journaled on bolts or pins T, that connect the upper and lower platforms.

U represents a pair of blocks arranged transversely between the beams N, at a suitable distance in advance of beams D, and having their ends bolted on the upper and lower sides of said beams N. A central opening is made in the block U concentric with the semicircular platform, and in the said opening is a pivotal bolt or pin, V.

\Y represents a frame comprising a pair of inclined upward-eonvergiug beams, X, and a plate orbeam,Y, connecting their upper ends and arranged in the same vertical plane with and directlyover the blocks U. A pair of inclined brace-bars, Z, have their upper ends bolted to the ends of the plate or beam Y and are bolted near their lower ends to the standard Z. A pivotal pin, A, projects from the cent-er of the plate or beam Y and forms the fulcrum for a yoke, 13.

0 represents the boom, which has its lower ends pivoted on a suitable support arranged under the center of and below the platform, and has its upper outer end connected to the ends of the yoke 13 by guy-chains D.

E represents a pair of parallel arms arranged on opposite sides of the boom bearing on the upper platform, P, and having their inner ends bolted to opposite sides of the block F, the said block beingpi voted on the upper end of the pin or bolt V. A similar pair of arms, G, are arranged under the lower platform, P, with their outer ends on opposite sides of the boom and their inner ends bolted to a block, II, which is in all respects similar to block F, and is pivoted on the lower end of pin V, and the outer portions of the arms E G are connected together by vertical bars 1. Guy rods or chains K connect the outer ends of arms E with the ends of the yoke B.

A chain, L, engages grooves in the pulleys M and S, and has its ends crossed and secured to the innermost pair of bars, I, the said chain being maintained. at the requisite tension by adjusting the bearing-pins L of the pulley M outward or inward in the openings N. Chains M are attached to opposite sides of the endless chain L, and to suitable drums or other devices, (not shoWn,) by which either side of the chain L may be drawn rearward in such manner as to cause the arms E and G to be swung to the right or left, and thereby turn the boom to any desired position.

It will be understood from the foregoing description that the arms E G, the boom, and the yoke are the only parts that turn, the turn-table platform P remaining stationary at all times.

A crane thus constructed is very cheap and simple, and may be operated with a minimum expenditure of power.

In some cases it may be desirable to dispense with the lower arms, G, and to lengthen the upper arms, E, and this may be very readily done.

Having thus described my invention, I claim- 1. The combination of the platform having the guiding-sheaves S, the boom, the pivoted arms on the platform on opposite sides of the boom, and the operating-chains attached to the said arms and engaging the guidingsheaves, whereby the boom may be swung to 'necting the outer ends of said arms to the ends of the yoke, and the operating-chains engaging the guidin -sheaves and attached to the pivoted arms', whereby the latter may be swung to move the boom in either direction, substantially as described.

3. The combination of the frame having the semicircular platform at one end provided with the guiding-sheaves and the adjustable tightening-sheaves N at the oppositeend, the pivoted arm on the platform, the endless chain engaging sheaves N, and the sheaves in the platform and attached to the pivoted arms, 5 5 for the purpose set forth, and the boom arranged between the pivoted arm's, substantially asdescribed. c,

In testimony that I claim the foregoing as my own I have hereto affixed my signature in 60 presence of two witnesses.

WILLIAM HAR RISOX WHEELER.

Witnesses:

DUNCAN LIVINGSTONE, THOMAS J. PURSELL. 

